Soil Remediation

Chromium, zinc, copper, lead, cadmium, mercury, and arsenic are among the most common metal contaminants found on remediation project sites.
REMOTOX® (Calcium Polysulfide Solution) is frequently used as an effective reducing agent for treatment of heavy metal contaminated soils.

Application advantages:

  • Effective against a broad spectrum of heavy metals and other contaminants of regulatory concern.
  • Converts hexavalent chromium (Cr(VI)) to trivalent state (Cr(III)) with precipitation to chromium hydroxide in a one-step reaction.
  • Delivers greater persistence and lateral transport away from injection wells.
  • Numerous applications, especially for Cr(VI), have been successfully conducted at industrial sites, domestically and abroad, over the past 30 years.
  • NSF approved for drinking water treatment, and widely used in agricultural applications to fruit trees, berries and as a soil conditioner.
  • Its residues are inert and non-toxic.

The US EPA has identified calcium polysulfide as a reagent suitable for use in in-situ chemical reduction of multiple contaminants. Several abstracts and studies are available through CLU-IN, the Hazardous Waste Clean-Up Information website, sponsored by the US EPA. Additionally, bench scale evaluation and case studies on ex-situ and in-situ Cr(VI) remedial methods, using calcium polysulfide, can be found in the ​Chromium (VI) Handbook available for purchase at CRC Press Online or at

For various other independent studies and presentations, samples and/or pricing information, please call us at 623-328-5175 or email us at

*Quick Links to Case Studies:

In-situ remediation of heavy metals using sulfur-based treatment technologies
In-situ chemical reduction at the Morses Pond Culvert, Wellesley, Massachusetts
Remediation of Chromium-Contaminated Site using Calcium Polysulfide (see page 6)
In-Situ Hexavalent Chromium Reduction and Geochemical Fixation in Limestone
In-Situ Redox Manipulation (ISRM) Barrier in the K-100 Area of the Hanford Site
Calcium Polysulfide Treatment of Cr(VI)-Contaminated Soil

*Links to third-party sites ("Hyperlinks") do not constitute an endorsement by Graus Chemicals and Graus Chemicals is not responsible for the availability of these sites or their contents.